There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
#1) Isabel Dos Santos â The Richest Black Woman in the World. Wealth: $3.5 Billion. Being richest black investor, Isabel DOS Santos holds considerable stake in some of the biggest companies in Africa. With a net worth of $3.5 Billions, she is the richest person in Angola which is a country in the continent of Africa.